Pump



y 14, 1929- s. 'auRRows' 1,713,417

PUMP

Filed April 19. 1928 Patented May 14, 1929.

UNITED STATES STANLEY BURROWS, OF PETONE, WELLINGTON, NEW ZEALAND.

PUMP.

Application filed April 19, 1928, Serial No. 271,349, and in New Zealand April 27, 1927.

This invention relates to pumps, and has for its object the provision of an improved form of pump suitable for pumping oil and other fluids at any pressure, and at high speeds, the form to beherein described being particularly adapted for use in conjunction with the tipping gear of motor vehicles, for raising and lowering the bodies of the latter when, and after, discharging loads therefrom.

The pump, according to the invention, has a central intake, and a peripheral delivery, with a hollow double ended ram, open at its outer ends reciprocable across said intake, the ram ends receiving fluid at the inner limits of their strokes and forcing same through the pump delivery at the outer ends of their strokes.

The reciprocable double ended ram is operated through an eccentric pin on the spindle of the pump, which may be driven by a direct coupled motor through a rigid or flexible shaft or shafts from a remotely ituated motor.

A cock or valve is provided in the pump 'for controlling the passage of fluid between the reservoir with which the pump is in communication and the apparatus which the latter is designed to operate.

The above mentioned and other features comprised in the invention, are illustrated in the accompanying drawing and will be further described in conjunction therewith Figure 1 being a cross sectional elevation of the pump and Figure 2 a vertical section of the latter taken at right angles to the section in Figure l and showing part of the fluid reservoir and portion of a direct coupled motor,

Figure 3 is a detail view partly in elevation and partly in section of the double ended ram,

Figure 4 a partplan View and a part sectional plan view of the ram.

Figure 5 a sectional elevation of the pump casing.

Figure 6 a sectional elevation of the pump casing taken at right angles to the section shown in Figure 5.

Figure 7 a detail view of the pump spindle and Figure 8 a section of the pump casing taken' through the same plane as the section shown in Figure 5, and illustrating a modification.

The pump comprises a flanged member 34 (Figures 5 and 6) in halves to facilitate rectangular opening 36 in which the slotted connecting portion of the double ended ram 35 operates, and maintaining a pressure tight oint between the suction or intake side 33 of the pump and the peripheral oil space 31 or the delivery side thereof a flat ring 33 preferably being inserted said member 34 and the. pump body. At diametrically opposed points the boss portionof said member 34 is bored radially as at 37 to take the hollow endsof the ram 35, said hollow ends containing'holes 38 made at right angles to the major axis of the ram 35, the holes 38 when the ram end containing them is moved inwards to its full extent, being opened through the central opening 36 in the member 34 to the pump intake 33, which is at the centre of the pump, the opposite hollow end of the ram 35 being meanwhile forced outwards to its full extent.

The outer ends of the radial bores 37 in the boss portion of the flanged member 34 aforesaid open through projections on said boss portion, valve plates 39' working between guide pins 40 and conforming to the acking curve of the interior of the pump body and also to the curve of the projections of said boss portion normally closing the outer ends of said radial bores 37 under the action of a spring 41 encircling the boss portion of the flanged member 34.

' The pump spindle 42 (Figure 7) is provided at one end with an eccentric. pin 43 which is entered in a block 44 slidable in the slotted connecting portion 35 of the double ended ram 35, so that when the spindle 42 is rotated said pin 43 imparts a reciprocating movementto the double ended ram 35 through the block 44 slidable in the slotted portion 35 thereof.

When about to complete the discharge or delivery stroke of the pump, each hollow end of the ram 35 is near the outward limit of its stroke, and shortly afterwards it commences to move inwards again until its radial or right angle holes 38 are opened to the pum intake 33 through the opening36 and fluid is drawn into the hollow ram end.

Upon the ram end commencing to move outwards again, its holes 38 are cut oil from the opening 36 open to the pump intake 33,

etween the fluid imprisoned in the rain end being compressed or forced outwards as said end approaches a pump discharge or delivery opening 23, whereby the valve plate 39 covering the outer end of the bore 37 in which the ram end operates, is lifted againstthe action of the spring ll to permit the imprisoned fluid to escape from the hollow ram end and be forced either through the pump discharge or delivery openings 23to pass via pipes 22 to perform useful work, or to a passage 32 which communicates with a bore 25 contain ing a control valve plug 24L from which bore 25 the fluid passes to the reservoir 3.

Y The passage of fluid between the reservoir 3, and the apparatus the pump is designed to operate, such as the cylinders and rams of vehicle body'tipping gear, is controlled by any suitable hand operated valve or cook one form of which can comprise the tapered cock plug 24, inserted in the bore 25 in the pump body,-in communication with the peripheral oil space 31 of the pump 5 through the passage 32, said plug 24 being pressed into a tapered seating by sprin 26 in compression between said plug2 l, and a plug 27 which closes the outer endof the bore .25, the opposite end of the cock plug 2 1 bein extended to provide a stem projecting from the pump body, and on which is rigidly secured alever 7' through which the cock plug 2% may be operated.

The cock plug 2e also has opening through its inner end an axial bore 28 which communicates with a passage 29 capable of being made to register with a return passage 30 for fluid through the pump body to the reservoir 3. lVith the return passage 3' ust mentioned closed by the cock plug 24, or other form of control valve, fluid placed under pressure by the pump 5 is passed from the latter via the pipes 22 to perform work, such as elevating the rams of vehicle body lifting gear or with said return passage 30 closed by the cock plug 24 or other form of control valve and the pump not operating the return of fluid through the pump and to the reservoir 3 is prevented, and the rams or other apparatus will be held stationary, while if the return passage 30 aforesaid be opened by said cock plug 24: or other form of control valve, fluid in the ram barrels or other apparatus will be free to return via thepipes 22, pump outlets 23, peripheral oil space 31, passage 32, bores 25, and 28 and passages 29 and 30 to thereservoir 3.

In the form shown in Figure 5 meeting recesses in the halves of the flanged member 34 comprising the pump casing, are filled with lead or other suitable material 45, fter assembly with the double ended ram thereby constitutinga pressure tight joint between the suctionand delivery sides of the pump, also in order to obtain a peripheral pressure tight joint between said casing and the body of the trated.

pump a rin .416 of lead, copper or other suitable material is inserted as indicated in Figure 2.

V The intake 33 to the pump 5 can be through an elbow extending into the reservoir 3 to c which the pump body can be but is not neces-' sarily attached.

The bores at 3'? in the boss portion of the flanged member 3st an be lined with hardened steel bushes 37 pressed in while the halves of said members at can be splined to lit together (Figure 8) to form a pressure tight joint.

lVhat I do claim anddesire to obtain by Letters Patent of the United States of America is LA pump comprising a circular casing having an axially located intake, and a peripher al delivery outlet, and a double ended ram the ends of which are hollow and adapted to receive fiuid from the intake and reciprocable across the latter to force the fluid to the delivery outlet, and means for operating said ram, substantially as described and illustrator.

2. A pump, as inelaim of the ram operate in radial'bores and the body of the ram in a centralopening in the pump casing, said central opening being open to the axially located intake, and also wherein the hollow ram ends contain radial holes adapted to receive, through the central opening in the casing, fluid for transfer to the delivery side of the pump for the purpose set forth, substantially as described and illus- 3. A pump, as in claim 1 wherein the double ended ram works in a circular casing of less diameter than the internal diameter of the pump body and seated in said body to provide an annular oil space from which the discharge outlets lead, substantially as described and illustrated.

a. A pump, comprising a circular casing having an axially located intake and a peripheral outlet, a double ended ram, the ends of which are hollow and have radial holes, the rams being reciprocable past the central intake and working within a casing closed by a cover plate in a pump body, between which and the casing there is provided a space for the passage of fluid to the peripheral outlet, and means for operating said double ended ram, substantially as described and illustrated.

5. A pump comprising a circular casing having an axially located intake and a pcripheral outlet, and a double ended ram hollow at its ends and reciprocable across the intake which opens transversely of the direc- 'tion of reciprocation of the ram, the opposite ends of said ram operating in bores in the pump casing and being formed with transverse holes opening laterally of the hollow ends which latter receive fluid at the inner 1, wherein the ends limits of the strokes and force same through valves communicating with the outer ends of said bores during the outward strokes of said hollow ends substantially as described and illustrated.

6. A pump as in claim 5 wherein the double ended ram works in a circular casing adapted to fit into a recess in the pump body in which it is secured by a pump cover maintaining pressure-tight joints on each face of the said casing and providing an annular space between the casing and pump body for the working fluid, the discharge outlets of the pump communicating with said annular space. I

In testimony whereof I afiix my signature.

STANLEY BURROWS. 

